What kind of oil should I use / what is the "best" oil?

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Ken King
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Re: What kind of oil should I use / what is the "best" oil?

#91 Post by Ken King » Mon Jan 12, 2015 1:09 pm

After my post last summer, I did switch to the Mobil 1 15W-50 synthetic oil. I read somewhere that dino oils deteriorate when exposed to cold temperatures. Since I was buying the stuff by the case of 12 quarts (two at a time, in fact), I was concerned that I was using oil that was not up to spec, right out of the bottle, after it had gone through a couple of winters sitting in the garage. Moreover, there are many other advantages to synthetic oil, including better chemical and shear stability, better Viscosity Index and better resistance to evaporation, oxidation and thermal breakdown (from Wikipedia, "Synthetic Oil"). For good measure, it is about the cheapest oil of all those recommended in this blog, when bought in a 5 quart jug. A friend told me he had been using the Mobil 1 oil for years with no problem.

The only concern I've heard about synthetic oil is that it may leak more, but most engines have probably been rebuilt with better seal materials. I've not noticed any difference. Brad Penn is a semi-synthetic, so presumably one would already have the issue with that oil. Googling "synthetic oil advantages" turned up a good discussion on Howstuffworks, "Why would I upgrade to a synthetic motor oil?" If you're looking to get maximum engine life, I feel certain that the best oil is a synthetic, and the 15W-50 oil Mobil makes is designed for flat tappet engines with the recommended levels of zinc and phosphorus. You can check out the levels (1200 & 1300) here, page 2:
https://mobiloil.com/~/media/amer/us/pv ... guide.ashx
In my book, that makes it the "best oil" winner.
Last edited by Ken King on Mon Jan 12, 2015 2:07 pm, edited 3 times in total.
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Brian R Adams
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Re: What kind of oil should I use / what is the "best" oil?

#92 Post by Brian R Adams » Mon Jan 12, 2015 1:22 pm

Frank Leonetti wrote: Brian, do you still use/recommend West Marine? There is a West Marine near me but I can't find any info about its ZDDP content.
Thanks and thanks to all for your info, experience and research that benefits all of us.
Like most manufacturers and distributors, they don't put ZDDP information on the container, nor does West Marine mention it on their web site. I relied on the API rating CI-4/SL which indicates the oil does not meet the newer SM or SN ratings which have the reduced ZDDP levels.

Look on the label. If it says "CJ" (the diesel application) or "SM", "SN" it's not same stuff.

Brian

PS Here is the stuff they have today:

http://www.westmarine.com/buy/west-mari ... 86_002_511

You want the 15W-40. Description says:

"API Service Classifications: CF-2, CD-II, CD, CF, CE/SJ, SH and SG"

These are all older classifications, and should indicate legacy levels of ZDDP.
"In God we trust. All others bring data." W. Edwards Deming

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Brian R Adams
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Re: What kind of oil should I use / what is the "best" oil?

#93 Post by Brian R Adams » Mon Jan 12, 2015 1:46 pm

I transcribe here a post I made to a similar thread back in 2011:

viewtopic.php?f=1&t=27099

When an oil bottle says "CJ-4, CI-4" it means it meets the newer and more stringent "CJ-4" which requires the reduced ZDDP and trumps the "CI-4" part. Just because it also meets the older CI-4 requirements doesn't mean it also has the levels of ZDDP that were present in CI-4 or CI-4 Plus formula. I know it's confusing, so I should have said if you see "CJ-4" (and/or "SM") on the bottle, stop right there, read no further, and forget it, it is not what you are looking for (if you are looking for the old high levels of ZDDP.)

Simple, huh?

I cite Charles Navarro's (a sometime contributor to this forum) treatise on this topic. Some excerpts (added italics for emphasis are mine):

"I do not recommend the use of any SM or CJ-4 motor oils in any air-cooled Porsche"

"Many cam manufacturers have recommended Rotella T in the past for cam break in. Remember, this was the CI-4 Rotella T some manufacturers were recommending, not the new CJ-4 Rotella."

Here are typical P (Phosphorous) and Zn (zinc) for the older and newer API ratings:

CI-4: P:1150 Zn:1374
SL: P:994 Zn:1182

CJ-4: P:819 Zn:1014
SM: P:770 Zn:939

Read Charles' entire treatise here:

http://www.lnengineering.com/oil.html
"In God we trust. All others bring data." W. Edwards Deming

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Thomas Sottile
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Re: What kind of oil should I use / what is the "best" oil?

#94 Post by Thomas Sottile » Sun Apr 05, 2015 8:49 am

picking an oil is like picking a woman, they all will pretty much do. Some cost more, some last longer, others are better for certain needs. some come in large containers and others in small. some are pure others are synthetic your pay money you take your choice.

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Sonny Caudill
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Re: picking an oil

#95 Post by Sonny Caudill » Sun Apr 05, 2015 2:33 pm

I use Valvoline VR1 in our older cars ('60 356 and '66 427 Corvette) since it has a higher Zinc content and is designed for racing applications and older type motors. I've had good luck with it. I like dino oil for our old cars since it has a tendency to leak a bit less than the slippery synthetics (which I run in everything we have that is newer). I think most any oil will work fine these days...Just change it regularly and you'll be good to go!!
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Re: What kind of oil should I use / what is the "best" oil?

#96 Post by Richard Sjolund » Mon Jul 27, 2015 8:14 am

Jeffrey Leeds wrote:Ken, you might also consider Mobil 1 V-Twin, (20W-50) which is a motorcycle oil with nominal levels of Phosphorus of 1600 PPM and ZDDP of 1750 PPM. This is readily available through Amazon and many local FLAPS at competitive prices.

Neil Fennessey, our resident academic for matters such as this, recommended this oil to me several years ago, and supplied me with some from his own stash, when I found myself at the bottom of my dip stick at Lime Rock, and it has worked well for me.

Also Porsche Classic has "determined" that 20W-50 is the "appropriate" mix for air-cooled pre-'89 engines, and this fits that parameter as well.


I've been using the V-Twin Mobil 1 20W-50 for several years. A good feature is that you can find it in a auto parts store in a small town when you are far from home ---- that was not true during my short switch to Brad Penn ....

Dick Sjolund
Solon, (Iowa City), Iowa
1964 (September, 1963) 356 C Coupe #215661 (Ruby Red, color:6402)
(On the 356 Registry cover- November, 2005)

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George Walling
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Re: What kind of oil should I use / what is the "best" oil?

#97 Post by George Walling » Mon Jul 27, 2015 10:20 am

Richard is this V-Twin 1 Mobile a synthetic or conventional oil ?
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Richard Sjolund
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Re: What kind of oil should I use / what is the "best" oil?

#98 Post by Richard Sjolund » Mon Jul 27, 2015 10:44 am

George Walling wrote:Richard is this V-Twin 1 Mobile a synthetic or conventional oil ?

It is synthetic.

Dick Sjolund

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Re: What kind of oil should I use / what is the "best" oil?

#99 Post by Ian Butt » Wed Apr 27, 2016 10:23 pm

Richard Sjolund wrote:
Jeffrey Leeds wrote:Ken, you might also consider Mobil 1 V-Twin, (20W-50) which is a motorcycle oil with nominal levels of Phosphorus of 1600 PPM and ZDDP of 1750 PPM. This is readily available through Amazon and many local FLAPS at competitive prices.

Neil Fennessey, our resident academic for matters such as this, recommended this oil to me several years ago, and supplied me with some from his own stash, when I found myself at the bottom of my dip stick at Lime Rock, and it has worked well for me.

Also Porsche Classic has "determined" that 20W-50 is the "appropriate" mix for air-cooled pre-'89 engines, and this fits that parameter as well.


I've been using the V-Twin Mobil 1 20W-50 for several years. A good feature is that you can find it in a auto parts store in a small town when you are far from home ---- that was not true during my short switch to Brad Penn ....

Dick Sjolund
Solon, (Iowa City), Iowa
1964 (September, 1963) 356 C Coupe #215661 (Ruby Red, color:6402)
(On the 356 Registry cover- November, 2005)
I'm glad someone has mentioned V-Twin because I've been running it in my 993TT with success, as have many other 993TT guys. It's the only oil that doesn't smoke like a freight train at startup, including Motul 15w50 300v. It seeps through the turbo bearing seals into the compressor and gets ingested.

It is my understanding that it has been able to maintain the high levels of Zinc/Phosphorus because motorcycles don't have cats which get fouled by high concentrations of the metals and aren't as regulated for emissions in general. I don't run cats on my 993TT so it's a non-issue.

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Re: What kind of oil should I use / what is the "best" oil?

#100 Post by Jeffrey Leeds » Thu Apr 28, 2016 9:38 am

For anyone using the Mobil 1 V-Twin oil, Mobil is currently running it's annual rebate promotion of $12 for the purchase of 5 qts. and $15 for the purchase of 5 qts. plus an oil filter (use for your "other" car). Promotion expires May 31, 2016.

Details are here:
https://mobiloil.com/en/promotion/mobil ... obil-super
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Ian William Stockwell
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Re: What kind of oil should I use / what is the "best" oil?

#101 Post by Ian William Stockwell » Fri May 06, 2016 4:12 pm

I am interested in the comments for using V-Twin 20/50 motor oil after all it is designed for 4 stroke air cooled engines.
I have just seen an advert on Amazon UK for "Motor Factory" High Performance 20W50 oil designed for Harley Davidson air cooled 4 stroke engines.
Does anybody know if this is considered good enough for our beloved 4 stroke air cooled engines?
Also, after the interesting article in the Registry magazine ref. oil filters it would seem that not only is the question what the best oil is but also the best filter to match it.

Regards

Ian
Porsche engine DNA is Flat Four, Flat Six & Flat Twelve NOT Flat Battery Packs :(

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Kit Sodergren
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Re: What kind of oil should I use / what is the "best" oil?

#102 Post by Kit Sodergren » Sun May 08, 2016 2:10 pm

The chemistry of oil additives gets complicated very quickly. Two very good sites on this topic are at LN Engineering and Willhoit Auto Restoration. They've done the analyses and published what they've found. Two brands widely recommended and under $8/qt. are Swepco 306 20W50 and Brad Penn Racing 20W50. The Brad Penn is semi synthetic and available at Zim's, a Registry advertiser. Swepco is mineral based and available at Paragon and other online outlets. Other brands may also be satisfactory, but most are shorter on reliable data.

FWIW on oil filters, I like Mobil1 M1-209.

Happy motoring

Kit Sodergren
Davis, CA

Kirk Romanotto
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Re: What kind of oil should I use / what is the "best" oil?

#103 Post by Kirk Romanotto » Mon Jul 04, 2016 9:32 pm

I typically use brad penn in my 911 engines and have been happy with it. A local race shop sells it very reasonably. 12 quart case for $45-50 I think. No offense to the "Porsche" specific sellers but they seem to run a pretty big margin on it.

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Oil Recommendation for 356C

#104 Post by Wyatt Blankingship » Thu Sep 01, 2016 4:22 pm

I have been using Pennziol 20W-50 oil for sometime. It an API Servive SN oil. I am getting ready for an oil change. Upon reading up on API Srvice SN oils, I am not sure that this is the best oil for my engine. I would appreciate any comments/recommendations on this issue. Thanks, Wyatt Blankingship
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Wes Bender
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Re: Oil Recommendation for 356C

#105 Post by Wes Bender » Thu Sep 01, 2016 4:35 pm

Have you checked all the posts here viewtopic.php?f=1&t=27099 ?
Some days it just isn’t worth the hassle of chewing through the restraints......

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